// var colors = require('colors');
// console.log("zhangchasoheng".rainbow)


// let z = Symbol("zhang");
// console.log(z)


// let s = String("zhang");
// console.log(s)
//主要的区别是NaN等于自身，而精确相等运算符认为NaN不等于自身
console.log([...new Set([1,2,3,3,4,5])])
